Sorry guys, I dont know what I was wrong the other day now, I had swapped out tx1 and tx2 and it made no change.
I have just tried the amp with the primary of the audio transformer disconnected and absolutely no noise from the OP pair. (I did this before as well)
Any way I have just swapped TX1 & 2 for a couple of Russian ones and the noise has reduced drastically. I think I may need to look at changing the one I put in tx2 position as I thought these transistors were supposed to be RF ones and not sure how they will cope as being a driver.
Thanks for your help
Mike
I have just tried the amp with the primary of the audio transformer disconnected and absolutely no noise from the OP pair. (I did this before as well)
Any way I have just swapped TX1 & 2 for a couple of Russian ones and the noise has reduced drastically. I think I may need to look at changing the one I put in tx2 position as I thought these transistors were supposed to be RF ones and not sure how they will cope as being a driver.
Thanks for your help
Mike
